Scheduling emails in the user's timezone using QStash

A new feature was launched by Docsly to send email notifications summarizing user feedback, with the emails scheduled to be delivered in the user's timezone to enhance the user experience. The implementation allows users to choose email frequency and cancel scheduled notifications at any time, achieved through a unique solution involving scheduling cron jobs in the user's timezone without storing timezone data in the database. The solution leverages Upstash Redis and QStash's scheduling feature to manage these cron jobs effectively. A Next.js application was built to facilitate this, featuring API routes for scheduling and canceling email notifications, while ensuring that email delivery is secure and accurate through the use of verified signatures. This approach not only improves the timing of email notifications but also provides flexibility and control to the users over their notification preferences.